<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card class="box-card">
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <tree-table :data='catelist'
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
        class="treetable">
        <!-- 具名插槽 #isok="scope" -->
        <template v-slot:isok="{row}">
          <i class="el-icon-success" v-if="row.cat_deleted===false" style="color: lightgreen"></i>
          <i class="el-icon-error"  v-if="row.cat_deleted===true" style="color: lightred"></i>
        </template>
        <template v-slot:order="{row}">
          <el-tag v-if="row.cat_level===0" size="mini">一级</el-tag>
          <el-tag v-else-if="row.cat_level===1"  type="success" size="mini">二级</el-tag>
          <el-tag v-else type="warning" size="mini">三级</el-tag>
        </template>
        <!-- v-slot:opt="{row}" -->
        <template #opt="{row}">
          <el-button type="primary" icon="el-icon-edit" size="mini" @click = "editCateDialogById(row.cat_id)">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini" @click = "deleteCateDialogById(row.cat_id)">删除</el-button>
        </template>
      </tree-table>
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total">
      </el-pagination>
    </el-card>
    <!-- 添加 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialog"
      width="50%"
      @close="addCateDialogClosed">
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <!--  options用来指定数据源-->
          <!--  props用来指定配置对象 -->
           <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChange"
            clearable></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialog = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑 -->
    <el-dialog
      title="修改分类"
      :visible.sync="editCateDialogVisible"
      width="50%"
      @close="editCateDialogClosed">
      <el-form
        :model="editCateForm"
        :rules="editCateFormRules"
        ref="editCateFormRef"
        label-width="80px"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCateDialog">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data () {
    return {
      // 有分页，默认的分页查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 商品分类的数据列表，默认为空
      catelist: [],
      total: 0,
      // 为table指定列得定义
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          // 将当前列定义为插槽列
          type: 'template',
          // 表示当前这一列使用模板名称
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      // 控制添加分类对话框的显示与隐藏
      addCateDialog: false,
      // 添加分类表单的数据对象
      addCateForm: {
        // 将要添加的分类名称
        cat_name: '',
        // 父级分类的id
        cat_pid: 0,
        // 分类的等级，默认要添加的是1级分类
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      // 父级分类列表
      parentCateList: [],
      cascaderProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        checkStrictly: true
      },
      // 选中的父级分类的ID数组
      selectedKeys: [],
      editCateDialogVisible: false,
      editCateForm: {},
      editCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      }

    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      // console.log(res.data)
      this.catelist = res.data.result
      this.total = res.data.total
    },
    handleSizeChange (newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange (newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    showAddCateDialog () {
      // 获取1，2级分类数据列表
      this.getParentCatList()
      this.addCateDialog = true
    },
    async getParentCatList () {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类数据失败')
      }
      this.parentCateList = res.data
    },
    // 选择项发生变化触发这个函数
    parentCateChange () {
      // console.log(this.selectedKeys)
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
      } else {
        this.addCateForm.cat_pid = 0
      }
      this.addCateForm.cat_level = this.selectedKeys.length
    },
    addCate () {
      // console.log(this.addCateForm)
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败')
        }
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCateDialog = false
      })
    },
    addCateDialogClosed () {
      this.$refs.addCateFormRef.resetFields()
      // 清空级联选择器
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    },
    // 编辑
    async editCateDialogById (id) {
      const { data: res } = await this.$http.get(`categories/${id}`, { params: { id: id } })
      if (res.meta.status !== 200) {
        return this.$message.error('商品查询分类失败')
      }
      this.editCateForm = res.data
      this.editCateDialogVisible = true
    },
    editCateDialogClosed () {
      this.$refs.editCateFormRef.resetFields()
    },
    editCateDialog () {
      this.$refs.editCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.editCateForm.cat_id}`, { id: this.editCateForm.cat_id, cat_name: this.editCateForm.cat_name })
        if (res.meta.status !== 200) {
          return this.$message.error('商品分类编辑失败')
        }
        this.$message.success('商品分类编辑成功')
        this.editCateDialogVisible = false
        this.getCateList()
      })
    },
    async deleteCateDialogById (id) {
      const confirmResult = await this.$confirm('此操作将永久删除商品分类, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete(`categories/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除商品分类失败')
      }
      this.$message.success('删除商品分类成功')
      this.getCateList()
    }
  }
}
</script>
<style lang="less" scoped>
  .treetable{
    margin-top: 15px;
  }
  .el-cascader{
    width: 100%;
  }

</style>
